The BBC released a teaser which leaves no doubt that a Dalek will appear in the Doctor Who New Year’s special, Resolution. When asked if there would be any other returning foes in Series 12, Chibnall had this to say:

“Maybe we’ll do some more, I’ll have a think. We knew we wanted something big for the end of series special.”

This quote and a few others from the main cast are the only information released so far from the BFI Southbank screening. Several national newspapers such as The Mirror, the Daily Mail and The New York Times Post have shared the same handful of quotes.

Ryan, the Doctor, Mitch, Yaz, Resolution, BBC

Though Resolution is not included in Doctor Who: The Complete Eleventh Series DVD, it seems the showrunner is treating the special as the conclusion to Series 11.

“The Doctor Who New Year special is really explosive and ties up a lot of the loose ends from the series. It touches on themes we have already explored, friendship and family and love, but it is even bigger than the other episodes.”